Worst complaints manager ever Yusuf could not resolve my complaint

Just received one of the worst services ever from nedbank, money kept on disappearing in my account and coming back with no logical explanation from their call center agents. I have attached screenshots of messages of available balances the complaints manager Yusuf told me the smses are irrelevant the relevant ones are of those when my money is short. Sunday I received money from some and my available balance was R20 000and when I woke up the available balance was R15000 and something no1 can give me a proper explanation of what transpired I am only being told the R20 000 sms was not live but delayed but the person who sent me the money sent it exactly that time which was payshap. Yusuf went to an extent of telling me I am lying I did not receive money that time, I provided him with evidence that I received money that time. Had to ask the person who sent me the money to send me proof of payment which they did I am yet to receive an apology from Yusuf for insinuating that I am lying. Yusuf he is the worst complaint manager ever he did not listen to my complaint and over investigation on my matter. I am very disappointed with your services worst service ever